Spark-plug



earner ARTHUR V. ZLINSEL. OF LOS ANGELES. CALIFORNIA.

SPARK-rinus.

Specification of Letters Patent.

latented Ang'. il?. i920.'

Application filed June 17, 1919. Serial No. 304.939.

lle it known that l, mrrrnn Y. KtNsnL, a citizen ot the United States, residing at Los ngeles, in the county of Los Angeles and State ot California, have invented new and i 'ttul Improvements in Sparkldugs, ot' which the following' is a speeilieation.

M v object is to make a double gap spark plug'. and my invention consists ot the novel features herein shown7 described and claimed.

Figure 1 is a view in elevation ot a double gap spark plug embodying the principles ot my invention.

Fig. 2 is a vertical diametrical longitudinal sectional detail as on the lines Qn@ ot Figs. 1 and 3 and looking in the direction indicated by the arrows. v

Fig'. 3 is a. bottom plan looking in the dircction indicated by the arrow 3 in Fig. 2.

The metallic casing 1 comprises the head E2 having an internal screw threaded bore extending downwardly from its upper end. a neck t extending downwardly from the head 2 and having an internal packing seat the rim G extending downwardly troni the neck el. the neck T extending downwardly Atroni the rim G. the externally screw threaded nipple S extending down 'ardly 'from the neck T. and the housing 9 extending downwardly from the screw threaded nipple S, there being a straight bore 10 'from the seat 5 downwardlT through the portions li. T. ti and 9 and lateral openings 11v and 12 extending crosswise ot the bore 10 through the housing :land there being a secoiulary core seat `13 in the housing 9 at the lower end of the bore 10 and an internal screw thread 11 in the lower end of the housing 9 below the seat 13. and there being a secondary casing' 15 extending downwardly in line with the housing 9 and having an externally screw threaded nipple 16 litting the threads 14.

Gaskets 1T lit the seat 5, the main insulator 1R has an enlarged portion 19 fitting against the gaskets 1T, a. reduced portion 2l) extending downwardly in the bore 10 nearly to the level ot the tops ot the lateral openings 11 and 12. and a reduced portion Q1 extending upwardly from the enlarged portion 19 and having Aa neck 22 near its upper end. there being a central opening 23 extending trom the upper end tace 24 to the lower end tace 25. A

The conductor wire 26 is inserted downwardly tnrouglx the opening 223 and has a 'sparking end 2T below the end tace Gaskets lit the upper part of the enlarge! ment 19,'and a gland lil screwed down into the threads against the gaskets 2S to hold the insulator 1B tirmly in the casing 1. A cap 2i() the end tace "2l and the edge 31" oi tive cap is spun into the annular recess around the neck The central portion ot' the cap 2-1 tits against the head ot the wire 23 and the screw l.ireaded nipple Bil extends upwardly troni the center or" the cap tor the attachment of the wire.

The secondary insulator 3.1. tits the seatl ll in the housing 9, a secondary conductor 235 'extends through the center of the secondarj.' insulator 3l and has a sparking end 'li adjacent to the sparking end 2T, and a sparking end 3T upon its lower end. The. fourth sparking end is formed upon the conductor 39 and the fourth sparking end is mounted in opposition to the third sparking' end 3T. The conductor 39 comprises the sparking end 3S. the straight vertical portion l() extending downwardly from the sparking end 38.E the bend 41 extending from the lower end ot the portion L10. the inclined arm l2 extending outwardly 'trom he bend'll. and the straight portion 43 extending through the secondary casing 15 and rigidly iixcd in the casing.

il spark gap let is formed between the sparking ends 9,7 and 36, and a second spark gap is formed between the sparking ends 2li' and BS thus producing a double spark gap in a single line ot conductivity. The spark gap stil is in the chamber 10 and communicates with the explosive mixturein the c vlinder through the openings 11 and 12. The spark gap 4:5 is in the chamber 46 below the secondary insulator 34 and Within the secondary casing 15 ,and communi.- (rates with the explosivemixture through the open lower end or" the chamber 46.

Various changes may be made without departing from the spirit of my invention as claimed.

l claim:

A spark plug comprising a metallic casing. a main 'insulator mounted in the metallic casing its inner end terminating at a proper point within the casing, a conductor rod mounted centrallythrough the main insulator its inner end extending from the end ot the main insulator, a second insulator lixed in a recess Within the end et the ces ing opposite the inner end oi'" the main iiisuiatoi' having :i conducto? rod through the center thereof; its inner end positioned within propel. sparking disziiice of the inner end of the rod of the main insulator there being a chamber formed between the two insulators :md there being ports cui; through the Wall of the metallic casing communicating with the chamber, means ioi homing 1! 'the second insulator in place, and zi thii' conductor rod Connected 4with the metaic easing und having its free end disposed Within sparking distance of he oiitei eil-ii of the eoziduotoi rod in the second insulator thereby forming t-Wo spaik gaps within the plug' iii a sparking circuit.

In testimony whereof have signed of; nume to this specification.

ARTHUR V. KNSEL. 

